Where does “よし” come from?

よし (Japanese) comes from Old Japanese よ, from Japanese 夜, from Old Japanese よる, from Proto-Japonic yoru, from Proto-Japonic yo — night.

よし (Japanese): 縦し so-so; even if; 良し, 善し, 好し, 吉し, 佳し, 宜し all...

Definitions

  1. 縦し so-so; even if; 良し, 善し, 好し, 吉し, 佳し, 宜し all...

Ancestry of “よし”, step by step

よし traces back through two separate lines of ancestry.

via Old Japanese よ

StepLanguageWordMeaning
1Old Japaneseよ—
2Japanese夜night, evening
3Old Japaneseよる—
4Proto-Japonicyorunight
5Proto-Japonicyonight

via Old Japanese し

StepLanguageWordMeaning
1Old Japaneseし—

Words derived from “よし”

Every word from Proto-Japonic yo →Every word from Proto-Japonic yoru →Every word from Old Japanese よる →